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Recommended for: Grades 5-8

Resource: Bianca Gets in Gear

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Media Type:
QuickTime Video

Length: 3m 26s
Size: 9.5 MB

In this video segment from Cyberchase, Bianca has been invited to go biking with a friend. Her bike is old, so she goes to a bike shop to buy a new one. While she’s there she learns about gears on bicycles and how they work.

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Transcript (Rich Text Format Document)

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Teachers' Domain, Bianca Gets in Gear, published October 10, 2008, retrieved on ,
http://www.teachersdomain.org/resource/vtl07.math.number.rat.biancagear/

Frame and Focus
Follow Up
Standards

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Here are some Frame, Focus and Follow-up suggestions for using this video in a math lesson.

What is Frame, Focus and Follow-up?

Frame: There are many different kinds of bicycles. You may have noticed that bikes have gears. Some bikes have only one gear at the pedal and one gear at the rear wheel. Other bikes have many gears at the rear wheel and sometimes more than one at the pedal as well. What do you think these gears do? How do you think pedals and gears make bikes move?

Focus: As you watch this video segment, you’ll see a bicycle expert explain to Bianca how the gears on her bike work. Write down the two relationships described between the number of teeth on the gear at the pedal and the number of teeth on the gear on the back wheel.